[FWTools] GDAL hanging under Windows 2008 Server

Frank Warmerdam warmerdam at pobox.com
Wed Mar 25 10:52:09 EST 2009


The ECW driver used by FWTools is (I think) the old one where I hand
build the ECW SDK source.  I don't really trust it, and I suspect it is
the source of the problem, though I have also heard reports of similar
problems with GDAL and the latest SDK as built by Leica so I'm not sure
if upgrading will help.

Unfortunately, to upgrade you would need to move to something other than
FWTools, which might be difficult in your context.

Is there any possibility to avoid ECW imagery?

Best regards,

2009/2/12 Stephen Wealands <steve at wealands.net>:
> I'm using GDAL via the SharpMap mapping engine.  It makes use of the csharp
> wrappers to render imagery (in my case, ECW) to an image control on a web
> page.  I am currently running it under Windows 2008 Server.
> My problem is that I am finding that the gdal library is intermittently
> hanging when being requested for imagery.  I have got a log from
> ProcessMonitor here
> (http://spreadsheets.google.com/ccc?key=pnbsLIAZM8M_34TfXUVttcA) that shows
> where it occurs and thought someone here might be able to suggest what could
> be causing the problem.
> Rows 1-40 show a successful map creation operation (including display of ECW
> image).  Row 41 onwards shows what happens when the image is panned and gdal
> hangs.  Seems to be associated with 'gdalplugins', but I'm not sure what
> this is.  Row 64 is the line where it crashed.  Row 65 is the start of where
> I recycled the web app to get it back from hanging.
> Note that this runs fine much of the time and has never crashed when I am
> only displaying shapefiles.  However, when displaying raster images as well,
> this occasionally crashes and therefore gdal must be the involved somehow.
> Any ideas?
> Thanks, Stephen
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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